/Engine/Source/Runtime/Engine/Classes/Animation/AnimData/AnimDataNotifications.h
struct FSequenceLengthChangedPayload : public [FEmptyPayload](API\Runtime\Engine\Animation\AnimData\FEmptyPayload)
FFrameNumber
Frame0
Frame number at which the change in frames has been made
FFrameNumber
Frame1
Amount of frames which is inserted or removed starting at Frame0
FFrameNumber
PreviousNumberOfFrames
Previous playable number of frames for the Model